/Engine/Source/Editor/UMGEditor/Public/UMGEditorModule.h
Add an instance customization to the widget property view.
void RegisterInstancedCustomPropertyTypeLayout ( [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) Type, [FOnGetInstancePropertyTypeCustomizationInstance](API\Editor\UMGEditor\IUMGEditorModule\FOnGetInstancePr-) )